Collapsible baby bottle



FIG. 1 is a perspective view of a collapsible baby bottle, showing my new design; the broken line showing is for illustrative purposes only and forms no part of the claimed design;

FIG. 2 is a front elevational view of the collapsible baby bottle, the rear, left and right elevational views are mirror image of the front view;

FIG. 3 is a top plan view thereof; and,

FIG. 4 is a bottom plan view thereof. 

The ornamental design for a collapsible baby bottle, as shown and described. 